See:
Description

OCL

org.eclipse.emf.ocl.expressions	Abstract API for OCL expression syntax.
org.eclipse.emf.ocl.expressions.impl	Implementation of the API for OCL expression syntax.
org.eclipse.emf.ocl.expressions.util	EMF utilities for the OCL expression syntax API.
org.eclipse.emf.ocl.helper	Definition of the OCL Helper API for syntax completion support and a simplified parsing model.
org.eclipse.emf.ocl.parser	Definition of the extensible environment API for OCL parsing and evaluation.
org.eclipse.emf.ocl.query	Object Constraint Language query/constraint evaluation API.
org.eclipse.emf.ocl.query.impl	Implementation of the API for OCL queries.
org.eclipse.emf.ocl.query.util	EMF utilities for the OCL query API.
org.eclipse.emf.ocl.types	Abstract API for OCL types.
org.eclipse.emf.ocl.types.impl	Implementation of the API for OCL types.
org.eclipse.emf.ocl.types.util	EMF utilities for the OCL types API.
org.eclipse.emf.ocl.uml	Extensions to the Ecore metamodel for UML-specific concepts supported by the OCL language.
org.eclipse.emf.ocl.uml.impl	Implementation of the Ecore extensions in support of the UML constructs used by OCL.
org.eclipse.emf.ocl.uml.util	Standard utilities for the Ecore extensions in support of the UML constructs used by OCL.
org.eclipse.emf.ocl.utilities	Abstract API for OCL AST utilities.
org.eclipse.emf.ocl.utilities.impl	Implementation of the API for OCL AST utilities.
org.eclipse.emf.ocl.utilities.util	EMF utilities for the OCL AST utilities API.